Questions tagged [hvac]

(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.

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2answers
33 views

Insufficient airflow to front bedroom

I have a Bryant CNPV3017ALAAAAA furnace. There is a 28' duct run to a front bedroom that does not provide sufficient airflow in either heat or much more noticeably in cooling mode. On the furnace ...
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0answers
26 views

Home Heater Ignition Failure

My house’s heater uses a hot surface ignitor. The ignitor won’t come on. All I hear is the motor running and no attempt at ignition. A professional checked it out and said electronics are good. This ...
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16 views

Faulty thermostat replacement needed or faulty furnace?

sorry for the long read, but I have a few questions in regards to my furnace. I have an older system from the early 2000's (Honeywell PC8900 and a Lennox g50uh(x) furnace) in my newish house. It seems ...
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1answer
36 views

Can an ERV push air through an existing HVAC system

I have an existing HVAC system on a 2 story, 2500sq ft house + finished basement in Pennsylvania. We have radon in the basement, which fluctuates between 1 and 3.5. It's controlled by a mitigation ...
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1answer
30 views

PTAC through brick wall

I am doing a project where I bought old building and converting in to apartment unit. The building has brick wall and was thinking of putting PTAC like they have in hotel. Initially I was thinking of ...
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2answers
39 views

Does Manometer Tubing Size Affect Measurements?

Does the diameter & length of tubing used with a digital manometer affect gas pressure readings? I'm trying to measure the outlet gas pressure going into my furnace and I had to connect different ...
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0answers
31 views

Web-based remote access of my Carrier Infinity thermostat and Flash end-of-life

I have a Carrier Infinity system, installed some 3 years ago. I was able to access the thermostat over the internet until very recently, because the web access feature uses the Adobe Flash Player ...
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1answer
31 views

Does ambient temperature impact gas pipe sizing?

I'm running a gas line for a garage heater in a cold northern climate. At times the pipe could pass through air as cold as 0°F. Does pressure drop due to reduced pipe temperature present a concern ...
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1answer
30 views

Fixing tear in insulated HVAC duct?

Today, I replaced the exhaust fan in my laundry room. I didn't realize that there is an insulated HVAC duct right next to the exhaust fan in the ceiling. As I was wrestling the old fan out, I tore a 3 ...
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1answer
26 views

Advice on Furnace water leak, should I worry?

A week back we noticed our rug in front of the Furnace was soaked. Upon investigation I found that the leak appeared to be coming from a Vent Coupling (Vent Elbow) that leads out to our roof. I ...
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0answers
47 views

Ceiling Register Box Insulation and Airtightness - Is this correct?

I'm in the process of making all the ceiling punctures into my attic air tight and better insulated with caulk and spray foam to reduce moisture and my energy costs. However, the HVAC ceiling register ...
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1answer
24 views

Which limit switch controls the blower motor on my furnace?

My blower motor isn't shutting off after my heat shuts off, causing it to blow cold air into my house. I suspect that the fan limit switch is bad, but the furnace has at least four limit switches. ...
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0answers
13 views

Extra valves on AC lineset?

I'm installing a mini-split system in my shop, but realize I’ll probably need to move the outdoor unit in 6-12 months. Does it make sense to try to add a pair of valves to each line to allow them to ...
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3answers
31 views

When would you want/have/need to put in a post filter in an electrostatic air filter system?

The HVAC system has an Electrostatic air cleaning system and it uses a prefilter and has a slot for a post filter. I've been reading online that only the prefilter is good enough to get the job done ...
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0answers
22 views

Should I do away with the HVAC zone system entirely or spend the money to replace/update a non working system?

I know nothing about this but I have a two story 2000 sq. ft home built in 2006. The zone system failed. To update it will cost alot. To do away with the two zone system is much less. I'm not sure how ...
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0answers
38 views

Leaving one zone manually open

I just installed a new P5 Pure Pro trio oil boiler heating system replacement of old 27 year old system, and with the new system I converted to zone values from 5 circulators now I have one circulator,...
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1answer
32 views

Carrier HVAC: CO Alarm and Smells

I'm trying to figure out the right questions to ask. I've not had good luck with a HVAC service company when we first purchased the house. As I don't think I have any urgent risks given the 3x Nest ...
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1answer
26 views

How do I add a filter to the return air vent of my retrofitted forced air system?

I have a 1940 home with a basement and a forced air heat pump system that was added some time in the past decade by the previous owner. The ceiling in the basement is open, and the ducts were ...
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1answer
27 views

Nest learning thermostat 3rd gen - E80 error

Happy new year! I was installing the Nest learning thermostat (3rd gen) and run into a "no power on Y1 wire" problem...it is saying no power on yellow wire, NEST error code is E80. It is ...
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1answer
20 views

AC troubleshooting

I’m suspecting an upcoming issue with my split AC system. Currently it is working and cooling, however in the last week or so, I’ve noticed that after the AC reaches the set temp, the copper line ...
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4answers
64 views

How can I get my floor register to fit in the duct opening?

My duct opening is right next to the wall. I pulled out this old register to replace the baseboards but now I can’t fit it in the opening anymore. It seems like the existing duct gets in the way when ...
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1answer
23 views

Luxaire furnace ignitor shuts off before gas valve opens

I have two Luxaire furnaces in the house, same model. They both worked fine until a couple of days ago, when one of them didn't blow warm air anymore. My first thought was the igniter, so I replace it ...
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0answers
23 views

Air handler fan relay keeps shorting out after using heat

Comfortmaker - FEM4X3000BL I’ve had two fan relays go bad in the past month, each time after using heat. (This is in Florida, we only turn the heat on a few times a year.) Wiring diagram attached. Any ...
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1answer
54 views

Nest thermostat wiring to First Co air handler

I am replacing the existing thermostat with a nest thermostat E, and it gives me e195 error on the nest device. Looks like I am missing a C wire, so I checked the air handler in the attic (made by ...
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0answers
20 views

Why isn't my furnace starting?

We have a Consolidated Industries All Purpose upflow furnace which is not kicking on. We have replaced circuit boards, capacitor and the inducer motor. We also put a new thermostat in. It works fine ...
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1answer
28 views

Action but No Heat

Furnace (10 yrs - 2 stage)in the AM will start (motor) but no gas ignition. Pull the plug, allow the motor etc to settle down, and replug. motor starts , minute or so their is gas ignition and heat. ...
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1answer
14 views

carrier 80% furnace wonot startup

my carrier 80% furnace ,the inducer just started less than 30 second , then went off and caused the low pressure switch faulty code 32 , checked and found the voltage just 58 V
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1answer
38 views

Air filter stacking

The idea of stacking air filters is a tricky proposition. With all these HEPA filters on the market , one may think a better flow can be achieved and better quality of air as a result of finer air-...
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0answers
30 views

How to wire 7-wire thermostat and restart

We setup a sensi smart thermostat by combining the Blue and Orange wire into the O/B connector and Black to C. This had the heat and fans working but NOT cooling. We adjusted by trying to put Blue ...
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0answers
25 views

HVAC trying wire new thermostat old trane to new sensi smart touch

My old trane thermostat b modle # 3AAT80B1A1 has wires R red T tan O orange G green Y yellow X2 Black B blue U green W white new thermostat has RH power heating with jumper built in to RC cooling C ...
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1answer
30 views

Why does my humidifier not come on when heat is on?

Our HVAC setup includes a humidifier, but the control board seems to activate it only when the fan is on without heat/cool. Here's how I got to that conclusion: I hooked up my multimeter to the ...
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0answers
19 views

What is causing my ac unit and thermostat not to work with one another

Inside unit and thermostat are not working properly. In the beginning, something needed to be changed in it,it was a small black box and a round cylinder like plug thing.changed out the thermostat ...
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2answers
346 views

Gas fireplace won't stay lit

I have a new construction home with a gas fireplace (Copreci VCS-ECOMOD) that won't stay on when lit. If I leave the pilot on, the pilot is stable and stays lit indefinitely. Once I light the ...
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1answer
36 views

Can you use a heat pump for hydronic radiant?

I want to electrify the heating in my house. It's heated by a hydronic radiant system, fed by a propane boiler. Another loop from the boiler heats a hot water storage tank. The total floor surface ...
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0answers
13 views

Fixing sub-optimal Tempstar furnace vent installation but can't find part numbers

I have a Tempstar N9MSE0601714A furnace with 2" PCV vent pipes (that mate to 2.5" pipes). Whoever installed it didn't fallow the installation manual and I'm also reducing the number of ...
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1answer
27 views

4yr old heat pump doesn't label 24v C wire

I'm used to the gas furnaces, and I still want to swap out this 4 year old heat pump, but it would be too expensive. I recently bought a smart thermostat to try and help with the utility bills, but it ...
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1answer
26 views

Zoned Forced Air System Runs 2.5X Upstairs vs. Downstairs

I bought a house built in 2005, ~4100 sq. ft. Reasonably insulated to code, as required in Chicago, IL. I've got an upstairs thermostat and downstairs thermostat. Both are Nest thermostats ...
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0answers
13 views

Improving HVAC post Remodel

We are living in a house that was originally built in the 80s with a gas furnace and forced air. Prior to our purchase, the house underwent a significant remodel including the addition of two rooms ...
2
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1answer
57 views

Why does my first floor thermostat also make my third floor baseboards turn on?

(Possibly related to this question but I do not have the expertise to diagnose at the level of the author of that question) I moved into a new house recently that was billed as having three heating ...
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1answer
19 views

Air handler fan not shutting off why?

So the question is really in the title. My carrier air handlers fan will not shut off. I have done the following: checked to make sure the fan was not set to on via the nest t stat. pulled nest off ...
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1answer
25 views

wall heaters running even after thermostat reaches set temp [closed]

I have wall heater units connected to a thermostat. The room reaches temperature but heaters keep running. Have reprogrammed thermostat several times without success
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1answer
49 views

Had Air Scrubber put in HVAC… fan is on 24/7… but it no longer can maintain the temperature?

I had an Air Scrubber installed in the HVAC. Due to that, the HVAC fan is to be on 24/7. However, the system can no longer maintain the temperature it is set to. The HVAC is set at 73(HEAT) but I ...
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0answers
56 views

Burning smell from AC vents after installing new thermostat

I was installing a new thermostat (ecobee3 lite Smart Thermostat, 2nd gen) to my AC unit (ARUF61D14AA). I opened my current thermostat and noticed that I don't have a C-wire (which is required for the ...
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2answers
34 views

Does the combustion air inlet for a 95% HE furnace need to be sloped down the same degree as the exhaust?

I'm determining if existing 2.5" PVC furnace vent pipes can be moved inside an existing soffit box in my garage ceiling. To do this the exhaust outlet pipe could keep it's existing grade from ...
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1answer
21 views

Can I run my attic HVAC/Furance without an Air Cleaner/Purifier Filter

I have an Aprilaire 1410 air purifier attached to my attic HVAC/furnace. Does the air purifier serve the same purpose as a typical air filter in a HVAC/furnace or is it simply additional filtering? ...
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1answer
37 views

Furnace Not Running After First Cycle

My Trane XB90 model TUC060C936BA natural gas furnace will run without any apparent problems for its first cycle after being off for a while (several hours/overnight). From my non-expert understanding, ...
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1answer
30 views

Bleeding an old baseboard radiator

Background: Third floor radiators are cold. Pressure hovering around 11. Went to bleed everything and got stuck. I have these old things on the first floor: I can't find a traditional valve, all I ...
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1answer
72 views

Adding C wire for wireless thermostat

I'm trying to install a new wireless thermostat but my old setup only uses 2 wires; one white and one red. On the side of my furnace there is this transformer mounted. There are four cables on the ...
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1answer
63 views

Where would I connect the C wire in my HVAC system?

I'm upgrading the thermostat with a Eco Bee WIFI one. Where do I connect the C cable? (Rheem 15 to 20 years old.)
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0answers
21 views

Installed Honeywell T5 Thermostat Now No Heat or AC

I installed a new Honeywell T5 Smart Thermostat. All wiring appears to be correct, but I did blow the 5amp fuse in the handler while hooking it up. Replaced fuse, but still not able to get the AC or ...

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